Under users it says I have 2 Super Admins but I only see 1 (Multisite)

A developer just created a multisite for me and gave me a Super Admin login. I want to confirm that there is only 1 super admin account, but when I look under Network Admin, Users, it says:
All (1) | Super Admins (2)
Underneath that I only see 1 Super Admin (mine) with the 2 sites that I manage:
karenlucasphoto.com
karenlucasphoto.com/school/

Why do I only see 1 Super Admin if it says there are 2. If there is a hidden one somewhere how can I find it and delete it?

View the database with phpMyAdmin. Open the table wp_sitemeta (or replace wp_ with your prefix, which is visible in the wp-config.php file). Search for the row with a meta_key equal to site_admins. There in the meta_value column you will see serialized data that lists the usernames of the super administrators. If it starts with a:1 it means it is only one.